单项选择题

A chart position enclosed by a square is a(n)（）.

A.fix
B.estimated position
C.dead reckoning position
D.running fix

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单项选择题

A change of a documented vessel’s name can only be made by the（）.

A.American Bureau of Shipping
B.Commissioner of Customs
C.Treasury Department
D.Coast Guard

单项选择题

A chain bridle is used when towing astern because it（）.

A.is easy to connect
B.provides an effective catenary and absorbs shock due to its weight
C.makes rigging a swivel unnecessary
D.prevents the tow from yawing by the drag of the chains in a seaway

单项选择题

A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.

A.is more flexible and has the ability to absorb shock because of its weight
B.is less subject to wear and damage from abrasion
C.requires little maintenance
D.All of the above